This content provides you with a sample fan mechanical running test procedure in the manufacturing vendor shop. This article is a supplementary article for fan and blower inspection article. You may also review fan and blower inspection and test plan.
1. Scope and Field of Application
The present operative instruction has the scope to define the operating modalities and acceptance criteria for the running test of fan.
Mechanical Functional Test:
for fan (running test): functional test of rotating machine performed at settled value of rpm. It is carried out the bearings vibration measure as well as, the bearings temperature.
The Quality Control operator (QC) must:
The Technical manager (TM) must:
The Quality Assurance manager (QAM) must verify the right test execution.
Fan Mechanical Running Test - Test Limits
The test technical limits for fans running test are:
Fan is tested in the following conditions:
Impeller Arrangement: assembled on shaft with supports
Vibration: On the support casing in correspondence of two bearings
Temperature: On the support casing in correspondence of two bearings
Fan Mechanical Running Test - Test Execution
The fan is put into operation according to above design conditions.
The test time has been established in 120 minutes .
Before start up , the free and right sense of rotation of impeller must be checked.
During test , for each measurement positions , the following measures are carried out:
In the test will be measured :
At the end of mechanical functional test with positive results, QC will file the test data and sign the relevant step on workshop time sheet.
5. Acceptance Criteria
Vibration measured in velocity RMS mm/s in the 10 to 1000 Hz range are considered acceptable when the following data are satisfied:
It is possible convert the RMS-velocity values to peak-displacement amplitudes according to the formula:
Pk = 0.225 Vf/f
Vf = RMS Value of the Vibration Velocity (mm/s) at the frequency f
f = Vibration Frequency (Hz)
Pk= Peak-Displacement Amplitude
For grease lubricated bearings, temperature values equal or less than 70°C are acceptable, measured with ambient temperature of 20 °C. In any case ∆T of 50 °C will be applicable also for ambient temperature less or upper than 20 °C.
Any different temperature value upper the foreseen one shall be evaluated.
The described test shall be performed , where requested, using calibrated equipment.The instrumentation to be used consists in :
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